Beckhoff Digital Input Terminal - KL1104
The KL1104 is a Bus Terminal designed for industrial applications, specifically serving as a 4-channel digital input module operating at 24 V DC. This terminal efficiently acquires binary control signals from the process level and transmits them to the higher-level automation unit in an electrically isolated format, ensuring signal integrity.
Specifications
| Part # |
KL1104 |
| Manufacturer |
BECKHOFF |
| Category |
PLCs/Machine Control |
| Subcategory |
PLC Programming Terminal |
| Connection technology |
2-/3-wire |
| Specification |
EN 61131-2, type 1 |
| Number of inputs |
4 |
| Nominal voltage |
24 V DC (-15 % / +20 %) |
| “0” signal voltage |
-3…+5 V |
| “1” signal voltage |
15…30 V |
| Input filter |
typ. 3.0 ms |
| Input current |
typ. 5 mA |
| Current consumption K-bus |
typ. 5 mA |
| Electrical isolation |
500 V (K-bus/field potential) |
| Bit width in the process image |
4 inputs |
| Configuration |
no address or configuration setting |
| Weight |
approx. 55 g |
| Operating/storage temperature |
-25…+60 °C / -40…+85 °C |
| Relative humidity |
95 %, no condensation |
| Vibration/shock resistance |
conforms to EN 60068-2-6 / EN 60068-2-27 |
| EMC immunity/emission |
conforms to EN 61000-6-2 / EN 61000-6-4 |
| Protect. rating/installation pos. |
IP20 / variable |
| Pluggable wiring |
for all KSxxxx Bus Terminals |
| Approvals/markings |
CE, UL, ATEX, IECEx, DNV GL |
What our Experts Think
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Reliable industrial-grade input module: The Beckhoff KL1104 is a compact 4-channel digital input terminal designed for precise signal acquisition in automation systems.
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Seamless PLC integration: Built for the Beckhoff Bus Terminal system, it enables fast and straightforward integration into distributed control architectures.
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High signal accuracy: Engineered for clean, stable switching detection, reducing noise-related errors in demanding industrial environments.
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Space-efficient design: Slim form factor allows high-density I/O configuration inside control cabinets and machine panels.
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Robust industrial performance: Designed for continuous operation in harsh environments, including vibration, heat, and electrical interference.
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Flexible application use: Ideal for sensors, switches, and binary signal monitoring across manufacturing and process automation setups.
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Cost-effective scalability: Enables modular expansion of I/O points without redesigning the entire control system.
Q&A
Q: What is the Beckhoff KL1104 used for?
A: The Beckhoff KL1104 is a 4-channel digital input terminal designed to interface 24V DC field devices with a PLC or automation system.
Q: What applications is it suitable for?
A: It is used in industrial automation for reading sensors, switches, push-buttons, and other discrete signal devices in machine control systems.
Q: How does the KL1104 work?
A: It converts external 24V DC input signals into process data for a PLC via the Beckhoff Automation bus terminal system.
Q: What are its key features?
A: It offers 4 digital input channels, compact DIN-rail mounting, electrical isolation, and reliable signal acquisition for industrial environments.
Q: Is it compatible with all PLC systems?
A: It is designed for use with Beckhoff Bus Terminal (K-bus) systems and integrates seamlessly with Beckhoff TwinCAT-based control architectures.
Q: What voltage does it support?
A: It supports standard 24V DC industrial input signals commonly used in automation and control panels.
Q: Why choose the KL1104?
A: It provides a cost-effective, compact, and reliable solution for expanding digital input capacity in modular PLC systems.
Maintenance Tips
• Ensure stable 24V DC supply and periodically verify voltage quality to prevent input signal errors.
• Keep DIN rail mounting secure and check that the KL1104 terminal is firmly seated in the EtherCAT/terminal assembly.
• Inspect and tighten all field wiring connections to avoid loose contacts or intermittent digital input signals.
• Maintain proper grounding and shielding practices to reduce electrical noise and improve signal integrity.
• Keep the terminal and control cabinet clean, dry, and free from dust, oil, or conductive contaminants.
• Regularly check LED status indicators on the KL1104 for fault diagnosis and input signal verification.
• Follow ESD precautions when handling terminals to protect sensitive electronic components.
• Periodically inspect for overheating, discoloration, or physical damage in the terminal housing.
• Ensure proper cable routing away from high-voltage or high-noise equipment to avoid signal interference.
• Use system diagnostics via Beckhoff Automation control software to monitor input performance and system health.
Damage 
Loss 
Theft 
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